<template>
  <view>
    <view class="search-box">
        <uni-search-bar  @input="input" :radius="100"
        placeholder="请输入内容" cancel-button="none"></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" 
      :key="i"  @click="gotoDetail(item)">
          <view class="goods-name">{{item.goods_name}}</view>
          <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
        <!-- 标题区域 -->
        <view class="history-title">
          <text>搜索</text>
          <uni-icons type="trash" size="17" @click="clean"></uni-icons>
        </view>
        <!-- 列表区域 -->
        <view class="history-list">
          <uni-tag :text="item" v-for="(item,i) in histories" :key="i"
          @click="gotoGoodsList(item)"
          ></uni-tag>
        </view>
    </view>
    
    
    
    
    
  </view>
  
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        //搜索的结果列表
        searchResults: [],
        //搜索历史的数组
        historyList: []
      };
    },
    onLoad() {
      this.historyList =  JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      //input输入事件的处理函数
      input(e){
        clearTimeout(this.timer)
        this.timer = setTimeout(()=>{
          // 顺序不能颠倒
        this.kw = e
         this.getSearchList()
        },500)
         
          // this.saveServhHistory()
      },
      async getSearchList(){
        //判断搜索关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return 
        }
        const{ data: res }  = await uni.$http.get('/api/public/v1/goods/qsearch',{ query: this.kw})
        if(res.meta.status !== 200) {
          return uni.$showMsg()
        }
        this.searchResults = res.message
        this.saveSearchHistory()

      },
      gotoDetail(item){
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
        })
      },
      saveSearchHistory(){
        //保存输入内容
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        console.log(set);
        
        this.historyList = Array.from(set)
        
        //对搜索历史数据，进行持久化的存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
        
      },
      
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      }
    },
    computed: {
      //计算属性
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">

.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    
    border-bottom: 1px solid #efefef;
    
    .goods-name{
      //文字不允许换行(单行文本)
      white-space: nowrap;
      //超出部分隐藏
      overflow: hidden;
      //超出部分用...替换
      text-overflow: ellipsis;
      
    }
  }
}

.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    //uni-tag标签自带
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
  
}





</style>
